2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/118841The threats to security of the information originating owing to involuntary operations of the users of a CAD, and methods of its protection implemented in a complex CAD system of renovation of firms are considered: rollback, autosave, automatic backup copying and electronic subscript. The specificity of a complex CAD is reflected in necessity of rollback and autosave both of the draw and the parametric representations of its parts, which are the information models of the problem-oriented extensions of the CAD6 pages, 2 figures, in RussianComputational Engineering, Finance, and ScienceE.2; I.2.1; J.6text